@Lisa6669
This goal can be achieved by several methods.
If you use "professional tools", you can create a rule set for this and apply it to the specific dates.
Otherwise you can set the minimum stay for a specific time period in section "trip length", "custom trip lenghts", "Add another requirement".
You can customize pricing directly in the calender for those dates.
When using a ruleset you can increase price with a percentage (not with "Smart Pricing" turned on)